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gimp/libgimp/gimpthumbnailprocedure.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpthumbnailprocedure.c
* Copyright (C) 2019 Michael Natterer <mitch@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gimp.h"
#include "libgimpbase/gimpwire.h" /* FIXME kill this include */
#include "gimpplugin-private.h"
#include "gimpthumbnailprocedure.h"
#include "gimpprocedureconfig-private.h"
struct _GimpThumbnailProcedure
{
GimpProcedure parent_instance;
GimpRunThumbnailFunc run_func;
gpointer run_data;
GDestroyNotify run_data_destroy;
};
static void gimp_thumbnail_procedure_constructed (GObject *object);
static void gimp_thumbnail_procedure_finalize (GObject *object);
static GimpValueArray *
gimp_thumbnail_procedure_run (GimpProcedure *procedure,
const GimpValueArray *args);
static GimpProcedureConfig *
gimp_thumbnail_procedure_create_config
(GimpProcedure *procedure,
GParamSpec **args,
gint n_args);
G_DEFINE_TYPE (GimpThumbnailProcedure, gimp_thumbnail_procedure, GIMP_TYPE_PROCEDURE)
#define parent_class gimp_thumbnail_procedure_parent_class
static void
gimp_thumbnail_procedure_class_init (GimpThumbnailProcedureClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpProcedureClass *procedure_class = GIMP_PROCEDURE_CLASS (klass);
object_class->constructed = gimp_thumbnail_procedure_constructed;
object_class->finalize = gimp_thumbnail_procedure_finalize;
procedure_class->run = gimp_thumbnail_procedure_run;
procedure_class->create_config = gimp_thumbnail_procedure_create_config;
}
static void
gimp_thumbnail_procedure_init (GimpThumbnailProcedure *procedure)
{
}
static void
gimp_thumbnail_procedure_constructed (GObject *object)
{
GimpProcedure *procedure = GIMP_PROCEDURE (object);
G_OBJECT_CLASS (parent_class)->constructed (object);
gimp_procedure_add_file_argument (procedure, "file",
"File",
"The file to load the thumbnail from",
GIMP_PARAM_READWRITE);
gimp_procedure_add_int_argument (procedure, "thumb-size",
"Thumb Size",
"Preferred thumbnail size",
16, 2014, 256,
GIMP_PARAM_READWRITE);
gimp_procedure_add_image_return_value (procedure, "image",
"Image",
"Thumbnail image",
TRUE,
GIMP_PARAM_READWRITE);
gimp_procedure_add_int_return_value (procedure, "image-width",
"Image width",
"Width of the full-sized image (0 for unknown)",
0, GIMP_MAX_IMAGE_SIZE, 0,
GIMP_PARAM_READWRITE);
gimp_procedure_add_int_return_value (procedure, "image-height",
"Image height",
"Height of the full-sized image (0 for unknown)",
0, GIMP_MAX_IMAGE_SIZE, 0,
GIMP_PARAM_READWRITE);
gimp_procedure_add_enum_return_value (procedure, "image-type",
"Image type",
"Type of the image",
GIMP_TYPE_IMAGE_TYPE,
GIMP_RGB_IMAGE,
GIMP_PARAM_READWRITE);
gimp_procedure_add_int_return_value (procedure, "num-layers",
"Num layers",
"Number of layers in the image",
1, G_MAXINT, 1,
GIMP_PARAM_READWRITE);
}
static void
gimp_thumbnail_procedure_finalize (GObject *object)
{
GimpThumbnailProcedure *procedure = GIMP_THUMBNAIL_PROCEDURE (object);
if (procedure->run_data_destroy)
procedure->run_data_destroy (procedure->run_data);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
#define ARG_OFFSET 2
static GimpValueArray *
gimp_thumbnail_procedure_run (GimpProcedure *procedure,
const GimpValueArray *args)
{
GimpPlugIn *plug_in;
GimpThumbnailProcedure *thumbnail_proc = GIMP_THUMBNAIL_PROCEDURE (procedure);
GimpValueArray *remaining;
GimpValueArray *return_values;
GimpProcedureConfig *config;
GFile *file;
gint size;
GimpPDBStatusType status = GIMP_PDB_EXECUTION_ERROR;
gint i;
file = GIMP_VALUES_GET_FILE (args, 0);
size = GIMP_VALUES_GET_INT (args, 1);
remaining = gimp_value_array_new (gimp_value_array_length (args) - ARG_OFFSET);
for (i = ARG_OFFSET; i < gimp_value_array_length (args); i++)
{
GValue *value = gimp_value_array_index (args, i);
gimp_value_array_append (remaining, value);
}
config = _gimp_procedure_create_run_config (procedure);
_gimp_procedure_config_begin_run (config, NULL, GIMP_RUN_NONINTERACTIVE, remaining, NULL);
gimp_value_array_unref (remaining);
return_values = thumbnail_proc->run_func (procedure, file, size,
config, thumbnail_proc->run_data);
if (return_values != NULL &&
gimp_value_array_length (return_values) > 0 &&
G_VALUE_HOLDS_ENUM (gimp_value_array_index (return_values, 0)))
status = GIMP_VALUES_GET_ENUM (return_values, 0);
_gimp_procedure_config_end_run (config, status);
/* This is debug printing to help plug-in developers figure out best
* practices.
*/
plug_in = gimp_procedure_get_plug_in (procedure);
if (G_OBJECT (config)->ref_count > 1 &&
_gimp_plug_in_manage_memory_manually (plug_in))
g_printerr ("%s: ERROR: the GimpThumbnailProcedure config object was refed "
"by plug-in, it MUST NOT do that!\n", G_STRFUNC);
g_object_unref (config);
return return_values;
}
static GimpProcedureConfig *
gimp_thumbnail_procedure_create_config (GimpProcedure *procedure,
GParamSpec **args,
gint n_args)
{
if (n_args > ARG_OFFSET)
{
args += ARG_OFFSET;
n_args -= ARG_OFFSET;
}
else
{
args = NULL;
n_args = 0;
}
return GIMP_PROCEDURE_CLASS (parent_class)->create_config (procedure,
args,
n_args);
}
/* public functions */
/**
* gimp_thumbnail_procedure_new:
* @plug_in: a #GimpPlugIn.
* @name: the new procedure's name.
* @proc_type: the new procedure's #GimpPDBProcType.
* @run_func: the run function for the new procedure.
* @run_data: user data passed to @run_func.
* @run_data_destroy: (nullable): free function for @run_data, or %NULL.
*
* Creates a new thumbnail procedure named @name which will call @run_func
* when invoked.
*
* See gimp_procedure_new() for information about @proc_type.
*
* #GimpThumbnailProcedure is a #GimpProcedure subclass that makes it easier
* to write file thumbnail procedures.
*
* It automatically adds the standard
*
* (#GFile, size)
*
* arguments and the standard
*
* (#GimpImage, image-width, image-height, #GimpImageType, num-layers)
*
* return value of a thumbnail procedure. It is possible to add
* additional arguments.
*
* When invoked via gimp_procedure_run(), it unpacks these standard
* arguments and calls @run_func which is a #GimpRunThumbnailFunc. The
* "args" #GimpValueArray of #GimpRunThumbnailFunc only contains
* additionally added arguments.
*
* #GimpRunThumbnailFunc must gimp_value_array_truncate() the returned
* #GimpValueArray to the number of return values it actually uses.
*
* Returns: a new #GimpProcedure.
*
* Since: 3.0
**/
GimpProcedure *
gimp_thumbnail_procedure_new (GimpPlugIn *plug_in,
const gchar *name,
GimpPDBProcType proc_type,
GimpRunThumbnailFunc run_func,
gpointer run_data,
GDestroyNotify run_data_destroy)
{
GimpThumbnailProcedure *procedure;
g_return_val_if_fail (GIMP_IS_PLUG_IN (plug_in), NULL);
g_return_val_if_fail (gimp_is_canonical_identifier (name), NULL);
g_return_val_if_fail (proc_type != GIMP_PDB_PROC_TYPE_INTERNAL, NULL);
g_return_val_if_fail (proc_type != GIMP_PDB_PROC_TYPE_PERSISTENT, NULL);
g_return_val_if_fail (run_func != NULL, NULL);
procedure = g_object_new (GIMP_TYPE_THUMBNAIL_PROCEDURE,
"plug-in", plug_in,
"name", name,
"procedure-type", proc_type,
NULL);
procedure->run_func = run_func;
procedure->run_data = run_data;
procedure->run_data_destroy = run_data_destroy;
return GIMP_PROCEDURE (procedure);
}
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